Drop-hammer.



No. 680,525. Y Patented Aug. I3, 190|.

P. HANzl-:n s. J.' CHEVALIER..

D R 0 P H A M M E R (Application led Apr. 23, 1900.)

(No Modei.)

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UNITED TnTs's ATsNT Carica,

PAULAIIANZER AND JEAN CHEVALIER, OF PETIT IVRY, FRANCE.

DROP-HAMM Ea.

SPECIFICATION forming part 0f Letters Patent N0. 680,525, dated August 13, 1901.

Application filed April 23, 1900. Serial No. 13,871. (No model.)

Be it known that we, PAUL I-IANZER and JEAN CHEVALIER, citizens of the Republic of France, residing in Petit Ivry, Seine, France, have jointly invented certain new and useful Improvements in Drop Hammers and Stamps, of which the following is a specification. This invention relates to that class of drop hammers and stamps wherein the hammer or 1o stamp is raised by means of rotating rollers or wheels made to clamp on the stem or handle of the hammer and lift the latter, the blow being delivered by releasing the said stem and allowing the hammer or stamp to fall; and the present invention consists in the means employed for mounting and operating the clamping'rollers.

In the accompanying drawings,which serve to illustrate an embodiment of the invention, Figure l is a side elevation of a hammer to which the invention is applied. In this View a part of the main frame is in section. Fig. 2 is a front elevation of the same with part of the main frame and the rollers in section. Fig. 3 is a horizontal section taken in the plane of the driving-shaft.

The hammer a has a stem b, preferably of hard wood, which is secured to the hammer at c. The stem or handle b of the hammer extends up through the box-like head of the frame 7c, on which are mounted guide-rollers u, which compel the stem to move always in the same path as it plays up and down. Mounted in the frame 7c is a driving-shaft Z, on which are tight and loose pulleys ma and a lifting-roller h. Mounted also in the frame 7c below is a shaft g, on which is an auxiliary lifting-roller d. These rollers h and d are so mounted in the frame that their peripheries are nearly in contact with one face of the stem h normally, and the roller h drives the roller d hrough the medium of sprocket- Wheels ac on the rollers and chains y on the said wheels 0c.

Hinged for convenience on and adapted to swing radially about the respective shafts l and g are bearing-frames j 'and f, in which are rotatively mounted, respectively, pressure-rollers vl and e, the peripheries of which are normally just out of contact with the face of the stem b opposite to the respective rollers h and d. Coupled at p and q to and connecting the respective swinging frames; and f is an upright rod 0, and a spring r upholds the pressure-rollers normally and maintains them in their inoperative position. By drawing down the rod 0 the pressure-rollers are caused to press the stem b to a bearing on the lifting-rollers h and CZ, so as to lift the hammer, and when the rod o is released the spring r elevates it, and thus removes the pressure on the stem b, so that the hammer is free to fall.

To operate the rod 0 conveniently, a levert is fulcrumed on the frame at u and coupled at s to the rod o.

It will be understood without the necessity of illustration that there may be sprocketwheels @c and a connecting-chain y at each end of rollers h and d, and it will also be understood that when the rollers are in their normal inoperative position, as seen at Fig. 2, they will be very nearly in peripheral contact with the stem b or in such a positionas to be put into bearing on the stem for gripping it by a moderate movement of the pressurerollers t' and e below or above the horizontal plane.

We are aware that it is not new, broadly, to operate a power or drop hammer by means of a guide-roller and a rotating pressure-roller, or two pressure-rollers, made to press on or clamp the stem or upright handle of the hammer, and this we do not claim. Our construction is characterized by the following features, which are new in this class of hammer, so far as we are aware: First, there are two superposed pairs of rollers, or one pair above the other, each pair comprising a pressureroller and a lifting-roller; second, the two superposed lifting-rollers are connected together by chain-gearing,one only being driven by the motor through the pulley m; third, the four rollers constituting the two superposed pairs are situated, respectively, at the four angles of a rectangle, jointed at the angles, in such a manner that by lowering one of the vertical sides of the rectangle the pressurerollers of the pairs are made to descend obliquely and bear simultaneously on the stem roo of the hammer, so as to press it up to the lifting-rollers without affecting the plane of movement of the hammer.

Having thus described our invention, We claim- 1. In adrop-hammer, the combination with a main frame, a hammer, its stem, and a r0- tatable roller in said main frame for lifting the hammer, the periphery of said liftingroller being normally adjacent to said stem, of a swinging bearing-frame for a pressureroller, means for operating said frame and a pressure-roller in said frame and adapted to bear on and press said stem up to the lifting-roller when said bearing-frame is shifted, substantially as set forth.

2. Ina drop-hammer7 the combination with the main frame, the hammer, its stem, and a rotatable lifting-roller mounted in said main frame with its periphery adjacent to one face of said stem, of a bearing-frame mounted to swing radially about the axis of said liftingroller, means for operating said bearingframe, and a pressure-roller carried by said bearing-frame and adapted to be pressed against said stem by the swinging of said frame, substantially as set forth.

8. In a drop-hammer, the combination with the main frame, the guide-rollers thereon, the hammer, its stem, and the driven lifting-rollers, said rollers having their peripheries adjacent to one face of said stem, ofthe swinging bearing-frames, means for operating them simultaneously, and the pressure rollers mounted in the respective bearing-frames, substan tially as set forth.

4L. In a drop-hammer, the combination with the main frame, the hammer, its stem, the guides on the main frame for said stem, and

the upper and lower lifting-rollers, mounted in the frame, of the swinging bearing-frames f and j, in the main frame, the pressure-rollers t' and e, mounted in the respective swinging frames, the rod o connecting the latter frames, the spring s, which upholds said frames and pressure-rollers, and the lever for operating the rod o, substantially as set forth.

5. In a drop-hammer, the combination with a main frame, a hammer, and its stem, of two pairs of rollers, one pair above the other, and each pair comprising` a rotating lifting-roller at one side of the hammer-stem, and a pressure-roller at the opposite side, gearing connesting the rotating lifting-rollers, and means for causing the pressure-rollers to press simultaneously onr the hammer-stem and force it into frictional contact with the lifting-rollers, substantially as set forth.

6. In a drop-hammer, the combination with a main supporting-frame, and a hammer provided With an upright stem, of four rollers situated at the respective angles of a rectangle, two of the superposed rollers at one side of said stem being rotating lifting-rollers, and the two opposite superposed rollers being pressure-rollers, and means for simultaneously drawing down the pressure-rollers obliquely toward the hammer-stem so that they bear forcibly thereon, substantially as set forth.

In testimony whereof we have signed this specification in presence of two subscribing Witnesses.

PAUL HANZER.

JEAN CHEVALIER.

l/Vitnesses:

EDWARD P. MAcLnAN, ALEXANDRE MATHIEU. 

